QwtPlotMarker (3)

#include <qwt_plot_marker.h>

Inherits QwtPlotItem.

Public Types

enum LineStyle { NoLine, HLine, VLine, Cross }

Public Member Functions

QwtPlotMarker ()

virtual ~QwtPlotMarker ()

virtual QwtDoubleRect boundingRect () const

virtual void draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &) const

QwtText label () const

Qt::Alignment labelAlignment () const

Qt::Orientation labelOrientation () const

const QPen & linePen () const

LineStyle lineStyle () const

virtual int rtti () const

void setLabel (const QwtText &)

void setLabelAlignment (Qt::Alignment)

void setLabelOrientation (Qt::Orientation)

void setLinePen (const QPen &p)

void setLineStyle (LineStyle st)

void setSpacing (int)

void setSymbol (const QwtSymbol &s)

void setValue (double, double)

void setValue (const QwtDoublePoint &)

void setXValue (double)

void setYValue (double)

int spacing () const

const QwtSymbol & symbol () const

QwtDoublePoint value () const

double xValue () const

double yValue () const

Protected Member Functions

void drawAt (QPainter *, const QRect &, const QPoint &) const

A class for drawing markers.

A marker can be a horizontal line, a vertical line, a symbol, a label or any combination of them, which can be drawn around a center point inside a bounding rectangle.

The QwtPlotMarker::setSymbol() member assigns a symbol to the marker. The symbol is drawn at the specified point.

With QwtPlotMarker::setLabel(), a label can be assigned to the marker. The QwtPlotMarker::setLabelAlignment() member specifies where the label is drawn. All the Align*-constants in Qt::AlignmentFlags (see Qt documentation) are valid. The interpretation of the alignment depends on the marker's line style. The alignment refers to the center point of the marker, which means, for example, that the label would be printed left above the center point if the alignment was set to AlignLeft|AlignTop.

enum \fBQwtPlotMarker::LineStyle\fP

Line styles.

See also:

setLineStyle(), lineStyle()

QwtDoubleRect QwtPlotMarker::boundingRect () const\fC [virtual]\fP

Returns:

An invalid bounding rect: QwtDoubleRect(1.0, 1.0, -2.0, -2.0)

Reimplemented from QwtPlotItem.

void QwtPlotMarker::draw (QPainter *painter, const \fBQwtScaleMap\fP &xMap, const \fBQwtScaleMap\fP &yMap, const QRect &canvasRect) const\fC [virtual]\fP

Draw the marker

Parameters:

painter Painter

xMap x Scale Map

yMap y Scale Map

canvasRect Contents rect of the canvas in painter coordinates

Implements QwtPlotItem.

void QwtPlotMarker::drawAt (QPainter *painter, const QRect &canvasRect, const QPoint &pos) const\fC [protected]\fP

Draw the marker at a specific position

Parameters:

painter Painter

canvasRect Contents rect of the canvas in painter coordinates

pos Position of the marker in painter coordinates

\fBQwtText\fP QwtPlotMarker::label () const

Returns:

the label

See also:

setLabel()

Qt::Alignment QwtPlotMarker::labelAlignment () const

Returns:

the label alignment

See also:

setLabelAlignment(), setLabelOrientation()

Qt::Orientation QwtPlotMarker::labelOrientation () const

Returns:

the label orientation

See also:

setLabelOrientation(), labelAlignment()

const QPen & QwtPlotMarker::linePen () const

Returns:

the line pen

See also:

setLinePen()

\fBQwtPlotMarker::LineStyle\fP QwtPlotMarker::lineStyle () const

Returns:

the line style

See also:

For a description of line styles, see QwtPlotMarker::setLineStyle()

int QwtPlotMarker::rtti () const\fC [virtual]\fP

Returns:

QwtPlotItem::Rtti_PlotMarker

Reimplemented from QwtPlotItem.

void QwtPlotMarker::setLabel (const \fBQwtText\fP &label)

Set the label. Parameters:

label label text

See also:

label()

void QwtPlotMarker::setLabelAlignment (Qt::Alignmentalign)

Set the alignment of the label. In case of QwtPlotMarker::HLine the alignment is relative to the y position of the marker, but the horizontal flags correspond to the canvas rectangle. In case of QwtPlotMarker::VLine the alignment is relative to the x position of the marker, but the vertical flags correspond to the canvas rectangle.

In all other styles the alignment is relative to the marker's position.

Parameters:

align Alignment. A combination of AlignTop, AlignBottom, AlignLeft, AlignRight, AlignCenter, AlgnHCenter, AlignVCenter.

See also:

labelAlignment(), labelOrientation()

void QwtPlotMarker::setLabelOrientation (Qt::Orientationorientation)

Set the orientation of the label. When orientation is Qt::Vertical the label is rotated by 90.0 degrees ( from bottom to top ).

Parameters:

orientation Orientation of the label

See also:

labelOrientation(), setLabelAlignment()

void QwtPlotMarker::setLinePen (const QPen &pen)

Specify a pen for the line.

The width of non cosmetic pens is scaled according to the resolution of the paint device.

Parameters:

pen New pen

See also:

linePen(), QwtPainter::scaledPen()

void QwtPlotMarker::setLineStyle (\fBQwtPlotMarker::LineStyle\fPst)

Set the line style. Parameters:

st Line style. Can be one of QwtPlotMarker::NoLine, HLine, VLine or Cross

See also:

lineStyle()

void QwtPlotMarker::setSpacing (intspacing)

Set the spacing. When the label is not centered on the marker position, the spacing is the distance between the position and the label.

Parameters:

spacing Spacing

See also:

spacing(), setLabelAlignment()

void QwtPlotMarker::setSymbol (const \fBQwtSymbol\fP &s)

Assign a symbol. Parameters:

s New symbol

See also:

symbol()

int QwtPlotMarker::spacing () const

Returns:

the spacing

See also:

setSpacing()

const \fBQwtSymbol\fP & QwtPlotMarker::symbol () const

Returns:

the symbol

See also:

setSymbol(), QwtSymbol

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